style.css

body {
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.space {
  position: absolute;
  z-index: 5;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  background-color: #000;
  overflow: hidden;
}

.rocket {
  max-width: 75px;
  animation-name: rocket;
  animation-duration: 100ms;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
}

.rocket img {
  position: relative;
  z-index: 20;
  max-width: 55px;
}

.rocket::before {
  content: '';
  display: block;
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  transform: translate(-50%);
  width: 15px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(
    180deg,
    #00B7FF,
    #00B7FF38
  );
  box-shadow: 0 0 40px #00B7FFA0;
  animation-name: fire;
  animation-duration: 100ms;
  animation-iteration-count: infinite;
}

.star {
  display: block;
  position: absolute;
  top: -250px;
  z-index: 1;
  transform: translateY(0);
  background-color: rgba(255, 255, 255, .8);
  box-shadow: 0 0 3px rgba(255, 255, 255, .2);
  animation: sleep linear infinite;
}


@keyframes rocket {
  0%, 100% {
    transform: translateY(-.8px);
  }
  
  50% {
    transform: translateY(.8px);
  }
}

@keyframes fire {
  from, to {
    height: 100px;
  }
  
  50% {
    height: 105px;
  }
}

@keyframes sleep {
  from {
    transform: translateY(0);
  }
  
  to {
    transform: translateY(150vh);
  }
}